K&N filters

[Dave Houser <mgs4dave@warwick.net>]

Does anyone have any experience with K&N Air filters on their MG's? Are
they available for T-series?
I am convinced that the only reason my oil is black after 3,000 miles on
the TD is those Hellings small foam but good looking air filters I have
on the 1-1/2's. I think that they're keeping large stones and
dragonflies out but that's about it. 
Has anyone made a durable filtering device for their car? What are the
clearance problems, etc.?

All input gratefully accepted,
Thanks,
Dave Houser